Process of producing coating compositions of acetyl cellulose.



a anr FFIGQ noinscrn'ivinnr, or rams, AND cLnRY RIVIERE, or PANTIN, NEARPARIS, FRANCE,

ASSIGNORS TO AGTIEN GESELLSCHAFT FUR ANILIN FABRIKATIO N, 0F BERLIN,

' GERMANY.

PROCESS OF PRODUCING COATING COMPOSITIONS 0F ACETYL CELLULOSE.

No Drawing.

To all whom it may concern:

Be it known that we, Louis CLfiMENT and CLiiRY RIVIISRE, citizens of theFrench Republic, residing at Paris and Pantin, near Paris, FrenchRepublic, (our post-office addresses being, respectively, 231 'RueLafayette, Paris, French Republic, and 6 Rue Etienne-Marcel, Pantin,near Paris, French Republic,) have invented certain new an usefulImprovements in Processes of Pro-f du'cing Coating 'Cbmpositions ofAcetyl Gel;

lulose, of which'thefollowing is-a' specifi cation.

' The invention is directed 'to a new process of producing coatingcompositionsof acetyl cellulose employing as solvents a mixture ofacetylene-tetrachlorid and a substance which enhances the solving power.ofv acetylenetetrachlorid for the ester and evaporates uniformly withacetylene-tetrachlorid;;;.

A very usual solvent for cellulosegesters, particularlyacetyl-cellulose, is acetylene tetrachlorid, towhich methyl or ethylalcohol must be added to increase its power of dissolving celluloseesters, particularly most varieties of acetyl-cellulose.

ings on materials (for instance, in making artificial leather, varnishedleather, peg

amoid or fabrics for aeroplanes), there is theobjection that the alcoholevaporates first and the remaining semi-solid mass can novacetyl-cellulose, the step which" consists in.

longer be sufliciently uniformly distributed over the material, becauseacetylene tetra-I, chlorid alone vhas not a suflicient' solvent powerfor the cellulose ester. The present invention-overcomes this objectionby adding to the acetylene tetrachlorid a substance which, like methylalcohol or ethyl alcohol,

enhances the solvent capacity of the acetylene tetrachlorid, but incontrast with these weight of acetylene tetrachlorid and-10 partsSpecification of Letters Patent.

When this mixture of solvents is used and the solution is applied forproducing by machinery-coat-I by weight of amyl alcohol, which mixturehas a surprising power of dissolving acetylcellulose. In coatingmaterials with this solution'the two constituents of the solventevaporate together, the acetyl-cellulose remains in solution throughoutthe operation v and in consequence the coating is distributed veryuniformly over the material. Y

(1 v T: Instead of the aforesaid proportion of acetylene tetrachlorid toamyl alcohol in the -mixture, other proportions may be used; so alsofusel .oil, for example, may be substituted for the amyl alcohol. Themethod ,may also be adopted for the'feebly nitrogenized acetylcelluloses(nitro-acetyl-celluloses) recently brought into commerce,

' Having now described the nature of 0111' I said. invention and thebest means we know of carrying the same into practical effect, We

claim V '1. In a process for producing coatings of cellulose ester thestep which consists in dis-.

solving cellulose ester in a mixture of acetyleneftetrachlorid and asubstance which enhances the solvent power of acetylene tetrachlorid forthe ester and evaporates uni- I forinly with the acetylene tetrachlorid.2. In a process for producing coatings of acetyl cellulose, thestep'which consists in dissolving the acetyl-cellulose in a mixture ofacetylene tetrachlorid and a substance containing amylalcojhol. i

' 3. In a process for-producing coatings of dissolving'theacetyl-cellulose in amixture of acetylene tetrachlorid and amyl alcohol.4. In a'p'rocess for producing'coatings of Patented Feb. 29, 1916.

Application filed November 3, 1913. Serial'No. 798,999.

acetyl-cellulose, the step Which'consis'ts in dissolving theacetyl-cellulose in a mixture.

of parts by weight of acetylene tetrachlorid and 10 parts by weight ofamyl alcohol. t

In testimony whereof we have hereunto set our hands in presence of twosubscribing.

witnesses.

LOUIS CLEMENT.

Witnesses HANSON C. Ooxn, CHARLES LOELE.

CLERY RIVIERE.

